1. The minimum bend radius depends on several things that we don't know
from your question. As a rule of thumb, keep it large as possible, but
it can safely go all to way to zero in some cases.

A few of the things to consider:
Dielectric type and thickness?
Adhesive type (if used) and thickness?
Conductor type, thickness and orientation?
Environmental conditions?
Number of cycles expected?
Speed of motion?
Circuit design (width, pitch, alignment)?
Plated through holes?

Any generic answer like 5X the thickness is far too imprecise for a good
design.

2. Component placement also depends on knowing more about the
application. Generally, components should be placed so that they are not
influencing the formation of a free loop in the flex area.

A few additional things to consider:
Through hole or surface mount?
Connector or devices?
Stiffener support?
Dynamic or just flex to install?
Strain relief?
Bend angle?

Andy Magee
(937) 435-3629
[log in to unmask]

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